gas shell

A gas shell, also known as a gas bomb, is a military projectile filled with a noxious gas. This gas is typically liquefied under pressure and released when the projectile explodes. Chemical weapons, including those delivered by gas shells, are employed for their toxic effects on humans, animals, and plants, causing harm through inhalation, skin absorption, or ingestion.12345

During World War I, choking agents like chlorine and phosgene were first used in gas attacks. These agents cause fluids to build up in the lungs, potentially leading to death by asphyxiation. Other types of chemical agents developed into weapons include blister agents, blood agents, and nerve agents. While many chemical compounds exist, only a few dozen have been weaponized, requiring them to be highly toxic yet manageable, and stable enough to withstand delivery.3654